Provided by: libcurl4-doc_7.55.1-1ubuntu2_all bug

NAME

       CURLINFO_CERTINFO - get the TLS certificate chain

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_CERTINFO,
                                  struct curl_certinfo *chainp);

DESCRIPTION

       Pass a pointer to a 'struct curl_certinfo *' and you'll get it set to point to struct that
       holds a number of linked lists with info about the certificate  chain,  assuming  you  had
       CURLOPT_CERTINFO(3)  enabled  when the request was made. The struct reports how many certs
       it found and then you can extract info for each of those certs  by  following  the  linked
       lists.  The  info chain is provided in a series of data in the format "name:content" where
       the content is for the specific named data. See also the certinfo.c example.

PROTOCOLS

       All TLS-based

EXAMPLE

       curl = curl_easy_init();
       if(curl) {
         curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.com/");

         /* connect to any HTTPS site, trusted or not */
         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);

         curl_easy_setopt(curl, CURLOPT_CERTINFO, 1L);

         res = curl_easy_perform(curl);

         if (!res) {
           struct curl_certinfo *ci;
           res = curl_easy_getinfo(curl, CURLINFO_CERTINFO, &ci);

           if (!res) {
             printf("%d certs!\n", ci->num_of_certs);

             for(i = 0; i < ci->num_of_certs; i++) {
               struct curl_slist *slist;

               for(slist = ci->certinfo[i]; slist; slist = slist->next)
                 printf("%s\n", slist->data);
             }
           }
         }
         curl_easy_cleanup(curl);
       }

AVAILABILITY

       This option is only working in libcurl built with OpenSSL, NSS, schannel or GSKit support.
       schannel support added in 7.50.0

       Added in 7.19.1

RETURN VALUE

       Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

SEE ALSO

       curl_easy_getinfo(3), curl_easy_setopt(3),